CN111227356A - Membrane mask - Google Patents
Membrane mask Download PDFInfo
- Publication number
- CN111227356A CN111227356A CN202010156346.6A CN202010156346A CN111227356A CN 111227356 A CN111227356 A CN 111227356A CN 202010156346 A CN202010156346 A CN 202010156346A CN 111227356 A CN111227356 A CN 111227356A
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- CN
- China
- Prior art keywords
- layer
- water
- film layer
- soluble film
- mask
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000012528 membrane Substances 0.000 title claims abstract description 29
- 239000002121 nanofiber Substances 0.000 claims abstract description 48
- 239000004744 fabric Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000010521 absorption reaction Methods 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 239000012982 microporous membrane Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- 229920013716 polyethylene resin Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 229920006037 cross link polymer Polymers 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- 241000894006 Bacteria Species 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 239000004745 nonwoven fabric Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000003020 moisturizing effect Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/02—Layered materials
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/12—Hygroscopic; Water retaining
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The invention discloses a membrane mask, which comprises a mask body and an ear band connected with the mask body, wherein the mask body comprises an outer fabric layer, a filter layer and an inner fabric layer which are sequentially arranged from outside to inside, the filter layer comprises a water-soluble film layer, a nano-fiber microporous film layer and a water-soluble film layer which are sequentially arranged from the outer fabric layer to the inner fabric layer, and the water-soluble film layer, the nano-fiber microporous film layer and the water-soluble film layer are sewn together with the outer fabric layer and the inner fabric layer.
Description
Technical Field
The invention relates to the technical field of masks, and particularly belongs to a membrane mask.
Background
The common medical mask, such as 3M N95 mask, has the working principle that static electricity is added on non-woven fabrics, the electrostatic adsorption principle is used to absorb the dust particles with static electricity in the air, but the bacteria and viruses are not always adsorbed with static electricity, because the aperture of the non-woven fabric is large, dust cannot be effectively blocked physically, and after the mask meets the breathing moisture, static electricity on the non-woven fabrics gradually disappears to lose the function of adsorbing electrostatic dust, so that the protection is invalid, the mask which depends on the electrostatic adsorption principle cannot be washed by water or alcohol, the static electricity is lost when the non-woven fabrics with static electricity meets water or alcohol, so that the adsorption function is lost, therefore, the mask can be used only for a short time at one time, is also called a disposable mask, has limited protective effect, has a storage period of at most 6 months, has no absorption function and loses efficacy after expiration static disappears, and therefore hospitals do not dare to prepare too many masks. Similarly, the mask containing the activated carbon structure needs to be packaged in vacuum, and the mask loses the due protective function of absorbing chemical substances due to the saturated adsorption of the activated carbon after the mask is opened.
Disclosure of Invention
The invention aims to provide a membrane mask, which solves the problems of short storage period and short disposable time of a common medical mask and improves the filtering effect of the mask.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides a membrane gauze mask, includes gauze mask body and the earlap with this body coupling of gauze mask, the gauze mask body include by outer precoat, filter layer, the interior precoat that sets gradually in to, the filter layer include by water-soluble rete, nanofiber micropore rete and the water-soluble rete that outer precoat to interior precoat orientation set gradually, water-soluble rete, nanofiber micropore rete and water-soluble rete and outer precoat and interior precoat make up together.
Furthermore, the filter layer include by the water-soluble rete, active carbon filter material layer, nanofiber micropore rete and the water-soluble rete that the inside precoat direction of outer precoat set gradually, water-soluble rete, active carbon filter material layer, nanofiber micropore rete and water-soluble rete and outer precoat and interior precoat make up together.
Further, the filter layer include by water-soluble rete, nanofiber micropore rete, the thin layer that absorbs water and the water-soluble rete that the inside precoat direction of outer precoat set gradually, water-soluble rete, nanofiber micropore rete, the thin layer that absorbs water and water-soluble rete and outer precoat and interior precoat make up together.
Furthermore, the filter layer include by the water-soluble rete, active carbon filter material layer, nanofiber micropore rete, the thin layer that absorbs water and the water-soluble rete that sets gradually of the inside precoat direction of outer precoat, water-soluble rete, active carbon filter material layer, nanofiber micropore rete, thin layer and the water-soluble rete of absorbing water and outer precoat and interior precoat make up together.
Further, the water absorption film layer is made of polyethylene resin containing starch grafted acrylate polymer cross-linked polymer, the thickness of the water absorption film layer is 0.1-0.3mm, and a plurality of through holes with the aperture of 2-3mm are formed in the water absorption film layer.
Further, the water-soluble film layer is one of a polyvinyl alcohol film, a carboxymethyl cellulose film, a hydroxyethyl cellulose film or a solidified cellulose film, and the thickness of the water-soluble film layer is 0.03-0.05 mm.
Further, the nano-fiber microporous membrane layer is composed of polyvinylidene fluoride fiber with the diameter of 400-800nm and/or polytetrafluoroethylene fiber, the thickness of the nano-fiber microporous membrane layer is 0.3-0.5mm, and the aperture of the nano-fiber microporous membrane layer is 150-350 nm.
Furthermore, the shape and the size of the filter layer are the same as those of the outer fabric layer and the inner fabric layer.
Furthermore, the ear belt is an elastic ear belt.
Further, the upper portion of gauze mask body be equipped with the metal strip nose and press from both sides, the metal strip nose press from both sides and make up on the gauze mask body, the middle part of gauze mask body be equipped with three decurrent folds, the fold set up in the lateral surface of gauze mask body.
Compared with the prior art, the invention has the following implementation effects:
1. the water-soluble film of the film mask has the capability of blocking air and bacteria from invading the nanofiber microporous film layer when the film mask is stored, so that the shelf life of the film mask is longer;
2. the water-soluble film of the film mask is dissolved when the film mask is used, and the moisture-preserving layers are formed on two sides of the nanofiber microporous film layer, so that the film mask has stronger adsorption capacity on bacteria and pollutants in the air, the filtering effect of the film mask is improved, and the filtering efficiency of the film mask exceeds 99.9%;
3. the membrane mask can be cleaned and dried by using a cleaning agent or hot water and then reused, and the nanofiber microporous membrane layer adopts a fluorine-containing nanofiber microporous membrane, so that the membrane mask has the advantages of moisture resistance and oil stain resistance, and the safety of the membrane mask in use is ensured;
4. the mask can be used for a long time, and after the mask is used for 6 hours, the filtering efficiency can still reach 96.3%.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view of the mask body in example 1.
Fig. 3 is a sectional view of a mask body in example 3.
Fig. 4 is a sectional view of a mask body in example 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation to be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1-2, the mask comprises a mask body 1 and an ear band 2 connected with the mask body 1, wherein the ear band 2 is an elastic ear band for convenient wearing. The mask body 1 of the membrane mask comprises an outer fabric layer 11, a filter layer and an inner fabric layer 12 which are arranged from outside to inside in sequence. The filter layer includes the water-soluble rete 14 that sets gradually by 11 inside precoat 12 directions on outer precoat, nanofiber micropore rete 13 and water-soluble rete 14, nanofiber micropore rete 13 and water-soluble rete 14 make up together with outer precoat 11 and interior precoat 12, the filter layer is the same with the shape and the size of outer precoat 11 and interior precoat 12, the upper portion of gauze mask body 1 is equipped with metal strip nose clamp 3, metal strip nose clamp 3 makes up on gauze mask body 1, the middle part of gauze mask body 1 is equipped with three decurrent folds 4, folds 4 set up in gauze mask body 1's lateral surface.
The water-soluble film has the capability of blocking air and bacteria from invading the nanofiber microporous film layer 13 when the film mask is stored, so that the shelf life of the film mask is longer; when the water-soluble film is used in the mask, the water-soluble film on one side of the inner fabric layer 12 is firstly dissolved due to the fact that a user exhales water vapor, then the water vapor penetrates through the nanofiber microporous film layer 13, the water-soluble film on one side of the outer fabric layer 11 is also dissolved, and the mask can be normally used like a common mask. However, due to the dissolution of the water-soluble film, moisture-retaining layers are formed on two sides of the nanofiber microporous membrane layer 13, particularly on one side of the outer fabric layer 11, so that the membrane mask has stronger adsorption capacity on bacteria and pollutants in the air, and the filtering effect of the membrane mask is improved, the air is filtered again by the moisture-retaining layers formed on one sides of the nanofiber microporous membrane layer 13 and the inner fabric layer 12, and the filtering efficiency of the membrane mask exceeds 99.9% according to the test of the method in GB 19083 plus 2003 medical protective mask technical requirement. The thickness of the water-soluble film layer 14 is 0.035mm, the thickness of the water-soluble film is generally not more than 0.05mm, the thickness of the water-soluble film is preferably 0.03-0.05mm, and the thinner thickness can cause the storage capability of the water-soluble film during the storage of the mask of the film to be reduced, and a moisture-retaining layer can not be formed during the use; and thicker films result in long dissolution times of the water-soluble films, which results in inconvenience in use. The water-soluble film layer 14 is a polyvinyl alcohol film, and of course, a film which is also easily soluble in water such as: the carboxymethyl cellulose film, the hydroxyethyl cellulose film or the solidified cellulose film can replace the polyvinyl alcohol film and can achieve similar and same effects,
in addition, the thickness of the nano-fiber microporous membrane layer 13 is 0.4mm, the aperture is 300nm, and the nano-fiber microporous membrane layer 13 adopts polytetrafluoroethylene fibers with the diameter of 500nm or polyvinylidene fluoride fibers with the diameter of 400 nm; of course, a combination material of the polytetrafluoroethylene fiber and the polyvinylidene fluoride fiber can also be used, and the diameters of the polytetrafluoroethylene fiber and the polyvinylidene fluoride fiber are controlled to be 400-800nm so as to ensure that the aperture of the nanofiber microporous membrane layer 13 is between 150-350nm, wherein the preferred diameters are that the diameter of the polytetrafluoroethylene fiber is 600nm and the diameter of the polyvinylidene fluoride fiber is 400 nm. And nanofiber micropore rete 13 adopts fluorine-containing nanofiber micropore membrane, has the advantage of anti-wet and anti-greasy dirt, makes the moisturizing layer can't adhere on nanofiber micropore rete 13, and makes the moisturizing layer can only adhere on outer precoat 11 and interior precoat 12, makes the moisturizing layer interval of nanofiber micropore rete 13 both sides come, avoids absorbing bacterium and pollutant between nanofiber micropore rete 13 and the outer precoat 11 to get into interior precoat 12, thereby has guaranteed the security that this membrane gauze mask used.
Because the nano-fiber microporous membrane layer 13 is used in the filtering layer of the membrane mask, the membrane mask can be cleaned by using a cleaning agent or hot water and dried and then reused.
In addition, the outer fabric layer 11 of the mask provided by the invention is made of waterproof fabric, so that the waterproof effect of the mask is improved; the inner fabric layer 12 is made of skin-friendly fabric, so that the comfort of the mask in use is enhanced.
Example 2
The difference from the embodiment 1 lies in that a water absorption film layer 16 is additionally arranged between the water-soluble film layer 14 on one side of the outer fabric layer 11 and the nano-fiber microporous film layer 13, the water absorption film layer 16 is polyethylene resin containing starch graft acrylate polymer cross-linked substances, the thickness of the water absorption film layer 16 is 0.3mm, a plurality of through holes with the aperture of 3mm are arranged on the water absorption film layer 16, the water accumulated between the inner fabric layer 12 and the nano-fiber microporous film layer 13 is absorbed by the water absorption film layer 16 when the mask is continuously used, and the comfort of the mask in use is improved.
Example 3
As shown in fig. 3, the difference from example 1 is that an activated carbon filter layer 15 is added between the water soluble membrane layer 14 and the nanofiber microporous membrane layer 13 on the side of the outer fabric layer 11, and the activated carbon filter layer 15 improves the adsorption capacity of the mask and improves the duration of the mask in continuous use. The common medical disposable mask needs to be replaced after being used for about 4 hours, and after the mask is continuously used for 6 hours, the filtration efficiency of the membrane mask can still reach 96.3 percent and exceed 95 percent of the filtration efficiency required by the medical protective mask by adopting the method in GB 19083 plus 2003 medical protective mask technical requirement.
Example 4
As shown in fig. 4, the difference from example 3 lies in that a water-absorbing film layer 16 is added between the water-soluble film layer 14 and the nanofiber microporous film layer 13 on the outer fabric layer 11 side, the water-absorbing film layer 16 is polyethylene resin containing starch graft acrylate polymer cross-linked substance, the thickness of the water-absorbing film layer 16 is 0.2mm, a plurality of through holes with the hole diameter of 2mm are arranged on the water-absorbing film layer 16, and the water-absorbing film layer 16 enables the water accumulated between the inner fabric layer 12 and the nanofiber microporous film layer 13 to be absorbed when the mask is continuously used, thereby improving the comfort of the mask in use.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a membrane gauze mask, includes gauze mask body and the earlap with this body coupling of gauze mask, the gauze mask body include by outer precoat, filter layer, the interior precoat that sets gradually in to, its characterized in that: the filter layer comprises a water-soluble film layer, a nano-fiber microporous film layer and a water-soluble film layer which are sequentially arranged from the outer fabric layer to the inner fabric layer, wherein the water-soluble film layer, the nano-fiber microporous film layer and the water-soluble film layer are sewn together with the outer fabric layer and the inner fabric layer.
2. The membrane mask of claim 1, wherein: the filter layer comprises a water-soluble film layer, an active carbon filter material layer, a nanofiber microporous film layer and a water-soluble film layer which are sequentially arranged from the outer fabric layer to the inner fabric layer, wherein the water-soluble film layer, the active carbon filter material layer, the nanofiber microporous film layer and the water-soluble film layer are sewn together with the outer fabric layer and the inner fabric layer.
3. The membrane mask of claim 1, wherein: the filter layer comprises a water-soluble film layer, a nanofiber microporous film layer, a water absorption film layer and a water-soluble film layer which are sequentially arranged from the outer fabric layer to the inner fabric layer, wherein the water-soluble film layer, the nanofiber microporous film layer, the water absorption film layer and the water-soluble film layer are sewn together with the outer fabric layer and the inner fabric layer.
4. The membrane mask of claim 1, wherein: the filter layer comprises a water-soluble film layer, an active carbon filter material layer, a nanofiber microporous film layer, a water absorption film layer and a water-soluble film layer which are sequentially arranged from the outer fabric layer to the inner fabric layer, wherein the water-soluble film layer, the active carbon filter material layer, the nanofiber microporous film layer, the water absorption film layer and the water-soluble film layer are sewn together with the outer fabric layer and the inner fabric layer.
5. The membrane mask of claim 3 or 4, wherein: the water absorption film layer is made of polyethylene resin containing starch grafted acrylate polymerization cross-linked polymer, the thickness of the water absorption film layer is 0.1-0.3mm, and a plurality of through holes with the aperture of 2-3mm are formed in the water absorption film layer.
6. The membrane mask according to any one of claims 1 to 4, wherein: the water-soluble film layer is one of a polyvinyl alcohol film, a carboxymethyl cellulose film, a hydroxyethyl cellulose film or a solidified cellulose film, and the thickness of the water-soluble film layer is 0.03-0.05 mm.
7. The membrane mask according to any one of claims 1 to 4, wherein: the nano-fiber microporous membrane layer is composed of polyvinylidene fluoride fibers with the diameter of 400-800nm and/or polytetrafluoroethylene fibers, the thickness of the nano-fiber microporous membrane layer is 0.3-0.5mm, and the aperture of the nano-fiber microporous membrane layer is 150-350 nm.
8. The membrane mask of claim 1, wherein: the shape and size of the filter layer are the same as those of the outer fabric layer and the inner fabric layer.
9. The membrane mask of claim 1, wherein: the ear belt is an elastic ear belt.
10. The membrane mask of claim 1, wherein: the upper portion of gauze mask body be equipped with the metal strip nose and press from both sides, the metal strip nose press from both sides and make up on the gauze mask body, the middle part of gauze mask body be equipped with three decurrent folds, the fold set up in the lateral surface of gauze mask body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010156346.6A CN111227356B (en) | 2020-03-09 | 2020-03-09 | Membrane mask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010156346.6A CN111227356B (en) | 2020-03-09 | 2020-03-09 | Membrane mask |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111227356A true CN111227356A (en) | 2020-06-05 |
| CN111227356B CN111227356B (en) | 2021-09-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010156346.6A Active CN111227356B (en) | 2020-03-09 | 2020-03-09 | Membrane mask |
Country Status (1)
| Country | Link |
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| CN (1) | CN111227356B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111616450A (en) * | 2020-07-13 | 2020-09-04 | 哈尔滨飞诺科技有限责任公司 | Non-medical nano-film filtering mask |
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| CN111227356B (en) | 2021-09-24 |
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